@posusgko
Hello there,
You are using far too many categories/tags on your posts. The rule of thumb is to use the least combined number of relevant categories and tags that accurately describe the content - not the most. Overuse of Categories and Tags results in this at WordPress.com > post not displayed on global tags pages > http://en.support.wordpress.com/global-tags/#missing-posts
Repeated overuse of categories and tags results in Google;e search spiders deciding you are a spamdexer (a person who over uses or misuses categories and tags in an attempt to gain search engine traffic), and that leads to them dumping your indexed posts into the supplementary index.

I'd like to recommend a tutorial prepared by Staff for new members. The Learn WordPress.com tutorial is divided into progressive levels and presented as a series: > http://learn.wordpress.com/
Happy blogging! :)

@podushko
I'd also like to recommend that you remove that site linked to your WordPress.com username and replace it with the correct link to your WordPress.com blog. Dashboard -> Users -> Personal Settings -> then scroll down to Account Details. Then scroll down to where it says ‘Website‘ select the URL for your primary wordpress.com blog and then "save changes".

Now every time you sign into the forum we can all click on your username and your blog will be linked to it. And every time you leave a comment on a blog your username can be likewise clicked and your blog can be instantly located.